Thread guide, particularly for textile twisting machines



April 963 w. RECHER 3,084,500

THREAD GUIDE, PARTICULARLY FOR TEXTILE TWISTING MACHINES Filed Oct. 15, 1959 2 Sheets-Sheet 1 IN VEN TOR.

Warns-r 2 d: BY

April 9, 1963 w. RECHER 3,084,500

THREAD GUIDE, PARTICULARLY FOR TEXTILE TWISTING MACHINES Filed Oct. 15, 1959 2 Sheets-Sheet 2 INVENTOR. Mum. Pewfl 3,034,569 THREAE GUEDE, PARTECULARLY FGR TEXTIL TWIETING MAQHHNES Werner Recher, Kempten, Aligau, Germany, assignor to Aligauer Maschinenhau G.rn.h.H., Kempten, Allgau, Germany, a firm Fiied Get. 15, 1959, Ser. No. 846,652 Claims priority, application Germany diet. 18, 1958 4 Qiaims. (til. 57-196) The invention relates to a thread guide particularly for twisting machines. The hitherto customary spiral thread guides bent from a wire into so called pigtail guides have the disadvantage that the thread rotates in the eye of the thread guide. The rotating movement of the balloon of yarn forms above the thread guide a second smaller balloon which however is undesirable in that it unfavourably influences the lower balloon and thereby also acts unfavourably on the ring runner. In conventional twisting machines in which the ring runner, together with the thread guide, moves uniformly upwards during heavy twisting, the distance between the thread guide and the supply roller decreases appreciably. For a given number of spindle rotations a higher degree of twist will be imparted when the ring runner and the thread guide are in the higher positions. In addition the upper balloon of yarn, when the thread guide is in the higher position, is substantially smaller than in the lower position of the thread guide so that the additional tension brought about by the upper additional balloon is relaxed in the thread. Due to this fact it has hitherto not been possible to produce a completely uniform twist.

Besides the spiral thread guides with circular eyelets a thread guide with an elongated eyelet is known in which the upper additional balloon is avoided by virtue of the fact that the thread is inserted in the pointed part of guide eyelet and remains there during the twisting process. By means of experiments it has been shown that this particular thread guide is of no use in machines in which the thread entry goes from the feed mechanism vertically or almost vertically into the spindle. With such machines the yarn rotates in the thread guide in spite of its elongated form thus in this case too the upper undesired additional balloon can be formed. The upper balloon can only be eliminated if the thread guide eye is set com pletely outside the middle of the spindle axle. With this setting only a completely irregular twist can be produced. From this it follows that this known elongated thread guide can only be used with those machines in which the thread entry is oblique. With an oblique thread entry the known pigtail with the round thread guide eye however, fulfils the same object. In addition, the thread guide with the elongated thread guide eye has the disadvantage that the rotation of the thread, stemming from the thread guide eye, can be continued as far as the supply mechanism. This rotation however is an unsatisfactory feature since it gives rise to a periodic variation in twist along the length of the yarn.

It is the object of the invention to provide a thread guide particularly for twisting machines in which the upper balloon of yarn is completely obviated and a rotation of the thread between the thread guide eye to the supply mechanism is completely eliminated.

The invention consists in the provision, closely above such as conventional pigtail guide, of a thread deflecting member, the deflecting edge of which lies outside the surface of the cylinder defined by the eye of the guide, such that the thread coming from a supply roller is guided in a curve around this deflecting edge to the guiding eye. Due to the sharp deflection of the thread at the deflecting eye the formation of the upper additional balloon is prevented. Thus the tension in the thread is always the 3,084,560 Patented Apr. 9, 1963 same so that a very uniform twist can be produced. In addition, due to the sharp deflection at the thread deflecting member which is provided closely over a conventional pigtail guide a rotation of the single threads between the thread guide and the supply roller is avoided. The twisting occurs therefore only from the thread guide downwards. Since in addition the distance between the thread guide and ring runner is always the same, an equal number of turns on a certain length is imparted to the thread regardless as to whether the thread guide eye and the ring rail are in their uppermost or lowermost position. By means of the new thread guide a completely uniform twist can therefore be produced which on a certain length always has the same number of turns. In order to make the new thread guide cheaply, the same is suitably so constructed that the remote end of the conventional pigtail guide, which end usually lies at the top of the guide, has an S-shaped extension of which the last S-loop is convex towards the thread guide shaft and lies closely over and outside the guide eye.

The advantages and details of the invention are explained in more detail in what follows with reference to one embodiment illustrated in the drawing.

FIG. 1 shows a ring twisting device with lowered ring rail and lowered thread guide rail with the use of the conventional pigtail guide;

FIG. 2 shows the same with raised ring rail and thread guide rail;

FIG. 3 shows the side view of the new thread guide;

FIG. 4 is a plan view of same;

FIG. 5 is a ring twisting device using the new thread guide with lowered ring rail and lowered thread guide rail;

FIG. 6 the same with raised ring rail and thread guide rail;

FIG. 7 shows a conventional thread guide in side view with a deflecting member fixed thereon;

FIG. 8 is the plan view of same;

FIG. 9 shows in plan a usual thread guide with a second deflecting thread guide arranged thereon;

FIG. 10 is the side view of the two thread guides according to FIG. 9.

In consequence of the rotation of the spindle ,1 a tensioning occurs in the yarn 2 by means of which the ring runner 3 is taken along with it. The yarn 2 which consists of two or more single threads is, in known manner, set in rotation around the spindle '1 and thus a so-called thread balloon 4 is formed. This thread ballon 4 produces in consequence of its centrifugal force a tension on the yarn 2. In order that this tension is not too great and that the thread balloons of adjacent spindles do not obstruct one another, two balloon stop rings 5 and 6 are also provided in known manner. If the yarn 2- as in the ring twisting apparatus illustrated comes vertically or almost vertically from the delivery roller 7 to the thread guide 3 then with a conventional round thread guide 'eyelet 8a as illustrated in FIGS. 1 and 2, the thread can rotate in the thread guide eyelet 8a, thus above the thread guide eyelet 8:; an additional balloon 9 is formed. This additional balloon is very undesirable since it gives the yarn, in consequence of its centrifugal force, additional tension. With high twisting the ring rail 10 moves, together with the balloon stop rings 5 and 6 and the thread guide 8, uniformly upwards and thus the distance L between the thread guide eyelet 8a and delivery roller 7 becomes smaller. With this smaller distance between the thread guide eyelet and the delivery roller, only a small upper thread balloon 9:: can be formed. The small balloon 9a imparts to the thread a slight additional tension in a manner akin to that imparted to the large upper thread balloon 9 with lowered ring rail 10 and lowered 3 thread guide 8. Thus the thread receives quite a difierent tension. Still more important and disadvantageous when twisting with the known pigtail guide 8 is the fact that the rotation imparted to the yarn 2 by the spindle rotation is propagated beyond the thread guide eyelet 3a as far as the delivery roller 7. As the spindle 1 rotates at the same rotational speed whether the ring rail 10 and thread guide rail 11 are in the upper or lower position, the lengths H and L respectively between the ring runner 3 and the delivery roller 7 vary on which a certain number of rotations is imparted to the yarn between the lowermost position of the ring rail and the uppermost position of the same. Since the speed of rotation of spindle 1 remains constant, the twist imparted ot the yarn is distributed over the distance h in the upper position of the rail 10. Hence in the latter position the degree to which the yarn is twisted is far greater than in the former .position, and thus the degree of yarn twist varies periodically with the conventional arrangement of FIGS. 1 and 2.

These disadvantages of the known thread guide are obviated 'by the new thread guide as illustrated in FIGS. 3 and 4. As can be seen in FIGS. v3 and 4 the free upwardly lying arm 12 of the conventional pigtail guide has an S-shaped extension 13 of which the extremity is indented towards the thread guide shaft 15 and lies above and outside the guide eyelet 16 formed by the helical lines. The thread from the delivery roller 7 is so greatly deflected in the indented portion =14 of the S-loop 13- that the rotational movement imparted to the thread by the rotation of the spindle and the ring runner 3 cannot be propagated upwards above the new thread guide 17. In FIGS. 5 and 6 a twisting apparatus having such a new thread guide 17 is illustrated. With the use of this new thread guide 17 the yarn 2 runs from the delivery roller 7 straight to the new thread guide 17, is deflected there and runsthrough the normal round eyelet 16 which is located exactly in the middle above the spindle 1 to the ring runner. The yarn 2 always receives therefore the same tension regardless of whether the ring rail 10 and the thread guide rail 11 is in the lower position shown in FIG. 5 or in the upper position illustrated in FIG. 6.

By the sharp deflection of the yarn 2 at the S-loop 14, the turning imparted to the thread by the rotation of the spindle and the ring runners are only formed as far as this loop 14 regardless of whether the ring rail and thread guide rail are in the upper or lower position. The distance of the thread guide eyelet 16 from the delivery roller 7 is completely without significance for the quality of the thread with the use of the new thread guide. The distance A between the ring runner 3 and the thread guide 17 is always the same. As the twisting of the thread 2 is confined with the new thread guide to the length A, a uniform twist is imparted to the thread.

In FIGS. 7 to 10 further embodiments of the new thread guide are illustrated and it is shown how a firm, for example, a spinning mill having many thousands of the conventional thread guides after a suitable reconstruction can use these as new thread guides. In FIGS. 7 and-8 a conventional thread guide 18 is illustrated. On the front portion of the thread guide 18 a wire hook 19 is fixed subsequently as a thread deflecting member by welding or soldering. Thus from an old thread guide a new thread guide with the above-mentioned advantages can be provided by a consequently cheap modification.

Exactly the same is also attained in that as shown in FIGS. 9 and 10, a second thread guide 22 arranged above a conventional thread guide 20 which is screwed in the thread guide rail 21 illustrated in dot-and-d'ash lines.

This deflecting thread guide may be constructed as shown in the drawing FIGS. 9 and 10. A conventional thread guide bent helically may however be used just as well as a deflecting thread guide. The deflecting thread guide 22 illustrated in the drawing however has the advantage that a thread can very easily be placed in this deflecting thread guide as same is open towards the front.

1 claim:

1. A yarn guide including a pigtail portion extending completely around and engaging an imaginary cylinder substantially in a plane normal to the axis of said cylinder and a deflecting portion fixedly positioned adjacent said pigtail portion in a plane substantially normal to the axis of said cylinder and having a yarn-engaging edge located radially beyond said cylinder so that yarn engaging the latter edge will be deflected before passing through said pigtail portion to prevent ballooning in advance of said pigtail portion, said yarn-engaging edge of said deflecting portion being directed away from said cylinder.

2. A yarn guide including a pigtail portion extending completely around and engaging an imaginary cylinder substantially in a plane normal to the axis of said cylinder and a deflecting portion fixedly positioned adjacent said pigtail portion in a plane substantially normal to the axis of said cylinder and having a yarn-engaging edge located radially beyond said cylinder so that yarn engaging the latter edge will be deflected before passing through said pigtail portion to prevent ballooning in advance of said pigtail portion, said deflecting portion having an arcuate configuration and said yarn-engaging edge thereof being concave and directed away from said cylinder.

3. A yarn guide as recited in claim 2 and wherein said deflecting portion is an integral extension of said pigtail portion.

4. In a twisting machine, in combination, rotary spindle means for rotating a take-up bobbin; delivery means located over said spindle means for delivering yarn to said bobbin; a pigtail yarn guide located between said delivery means and spindle means for guiding yarn from said delivery means to the bobbin rotated by said spindle means, said pigtail yarn guide extending completely around and engaging an imaginary cylinder substantially V in a plane normal to the axis of said cylinder; means operatively connected with said spindle means for ballooning the yarn between said pigtail guide and bobbin; and a yarn deflecting portion located between said delivery means and said pigtail guide adjacent to the latter in a fixed relation thereto at an elevation higher than the same and located outside of said cylinder substantially in a plane normal to the axis of said cylinder, said yarn deflecting portion having a yarn-engaging edge located radially beyond and directed away from said cylinder and engaged by the yarn moving from said delivery means to said pigtail guide so that the yarn is deflected around said deflecting portion before passing through said pigtail guide so as to prevent formation of a balloon between said delivery means and pigtail guide.

References Cited in the file of this patent UNITED STATES PATENTS 1,117,596 OConnell Nov. 17, 1914 1,134,315 Coldwell' Apr. 6, 1915 2,249,759 Gram July 22, 1941 2,361,041 Lasch Oct. 24, 1944 2,795,925 Parker et al June 18, 1957 FOREIGN PATENTS 26,228 Great Britain 1904 

1. A YARN GUIDE INCLUDING A PIGTAIL PORTION EXTENDING COMPLETELY AROUND AND ENGAGING AN IMAGINARY CYLINDER SUBSTANTIALLY IN A PLANE NORMAL TO THE AXIS OF SAID CYLINDER AND A DEFLECTING PORTION FIXEDLY POSITIONED ADJACENT SAID PIGTAIL PORTION IN A PLANE SUBSTANTIALLY NORMAL TO THE AXIS OF SAID CYLINDER AND HAVING A YARN-ENGAGING EDGE LOCATED 